<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>box-3-内容问题</title>
		<style type="text/css">
			.c{
				height: 200px;
				width: 200px;
				border: 30px solid red;
				margin: 5px;
			}
			.c2{
				padding: 80px;
				border: 20px groove blue;
				box-sizing: border-box;
				overflow: hidden;
			}
			.c3{
				padding: 80px;
				border: 20px groove blue;
			}
		</style>
	</head>
	<body>
		<div class="c"></div>
		<div class="c c2">
			教育改变生活
		</div>
		<div class="c c3"></div>
	</body>
</html>
